Research On Damage Identification Method Of Glass Components Of Hidden Frame Curtain Wall

Glass curtain wall has become an essential part of high-rise buildings,super high-rise buildings,city landmarks and other buildings,and is the core of the exterior decoration of buildings.Served,however,the complicated and changeable environment lead to hidden frame curtain wall glass components ageing,rust,loose connection problems emerge in endlessly,and curtain wall buildings in the crowded city core zone,glass components in case of damage will be a great threat to people’s security,therefore,how to accurately identify both the hidden frame curtain wall structure damage condition,the attention by people,This is also the core problem to be solved to prevent curtain wall safety accidents and protect people’s life and property safety.This article mainly aims at the structure of the hidden frame curtain wall glass component glue and bolt connection damage study,through the method of numerical simulation,study the hidden frame curtain wall glass component damage on the influence law of components,to explore the hidden frame curtain wall glass component damage criterion,for building glass curtain wall damage identification and monitoring system to lay the theoretical foundation,the main research contents are as follows:(1)The numerical simulation method was used to simulate and analyze the modal parameters of structural adhesive under different degrees of damage of glass components of hidden frame curtain wall.The obtained simulation analysis results were compared with the experimental results,which verified the feasibility of the numerical simulation method for structural adhesive damage identification research.(2)To more often appears in actual engineering structural adhesive damage problem set up different damage conditions,through the finite element static analysis on structural adhesive damage before and after the static characteristics of the study,found that with the increase of structural adhesive damage degree,the center of the glass panel deformation increased,the size of the deformation and the damage degree of structural adhesive has a significant linear correlation,The damage degree of structural adhesive can be identified by the deformation of glass panel.(3)Through the modal analysis of structural adhesive damage before and after the study of dynamic characteristics,it is found that with increasing structural adhesive damage degree,the natural frequency of the curtain wall structure is declining,and the size of the fourth order natural frequency and the damage degree is of obvious linear correlation,and has higher sensitivity for identifying the damage degree;The modal displacement curves of the joints around the glass panels have obvious abrupt changes at the damage position of the structural adhesive.Therefore,the damage degree of the structural adhesive can be identified by the fourth-order natural frequency change of the curtain wall structure,and the damage position of the structural adhesive can be located by the fourth-order and fifth-order modal displacement curves.(4)In view of the bolt damage problem that often occurs in practical engineering,different damage conditions are set,and static and dynamic characteristics of structural adhesive before and after damage are studied through static analysis and modal analysis.It is found that the deformation of glass panel increases with the increase of bolt damage degree.The second order and fourth order natural frequencies of the curtain wall structure decrease monotonically when the preload decreases.When the number of bolt damage increases,the frequencies of the first and fifth order of the curtain wall structure show a monotonically decreasing trend.The sensitivity of frequency to damage identification is obviously lower than that of deformation,but the modal displacement difference of the inner joint of the auxiliary frame increases obviously at the damaged position of the bolt.Therefore,the damage degree of the bolt can be identified by the deformation of the glass panel,and the damage position of the bolt can be located by the modal displacement curve.